CONTROL OF GARDEN DISEASES AND INSECTS. 



37 



that the plants will succumb to any ordinary attack. A rotation 

 should be practiced in which cabbage, cauliflower, etc., are followed 

 by plants other than cole crops. Fall plowing is advisable. Crop 

 remnants, and particularly cabbage stumps, should be removed and 

 destroyed, especially early in the season, since this protects other 

 cole crops against other pests which are harbored in the old stalks 

 or feed on the new leaves in early winter, to reappear the next spring. 

 The use of disks or pads of tarred paper for the protection of 

 cabbage against the oviposition of the fly was perfected in 1889 as 

 follows : 



The cards are cut in a hexagounl form (fig. 40. c) in order better to economize 

 the material, and a tliiuner jjrade of tarred paper than the ordinary roofing 

 felt is used, as it is not only cheaper, but, being more flexible, the cards made 

 placed about the plants 

 without being torn. 



The blade of the tool, 

 which should be made 

 by an expert blacksmith, 

 is formed from a band 

 of steel, which is bent in 

 the form of a half hexa- 

 gon, and then, taking an 

 .icute angle reaches 

 nearly to the center, as 

 shown in figure 10, a. 

 The part making the 

 star-shaped cut is formed 

 from a separate piece 

 of steel, so attached to 

 the handle as to make 

 a close joint with the 

 iilade. The latter is bev- 

 eled from the outside all 

 around, so that by re- 

 moving the part making 

 the star-shaped cut the 

 edge may be ground on 

 from it are more readily 

 .1 grindstone. It is important that the angles in the blade be made iterfect. 

 and that its outline represent an exact half hexagon. 



To use the tool, place the tarred paper on the end of a section of a log or 

 piece of timber and first cut the lower edge into notches, as indicated in 

 figure 40, Ji. using only one nngle of the tool. Then coumience at the left 

 side and place the blade as indicated by the dotted lines, and strike at the 

 end of the handle with a light mallet, and a complete card is made. Continue in 

 this manner across the paper. The first cut of every alternate course will make 

 an imperfect card, and the last cut in any course may be imperfect, but the 

 other cuts will make perfect cards if the tool is correctly made and properly 

 used. 



The cai-ds should be placed about the plants at the time of transplanting. 

 To place the card, bend it .slightly, to open the slit, then slip it on the center, 



a c 



Fig. 40. — (I. Tool for cutting tarred paper pads; b, dia- 

 gram showing- how tool is used, the dotted line showing 

 position of edge of tool ; c, tarred paper pad in outline. 

 a, b, One-fourth natural size ; c, one-half natural size. 



